Mixer-opening device.



No 892,321. PATENTED JUNE '30, 1908. F. B. SMITH.

MIXER OPENING DEVICE.

2 sums-s11 APPLIGATION FILED JAN. 15. 1907.

N NULNMN PATENTED JUNE 30, 1908.

F. B. SMITH.

MIXER OPENING DEVICE.

APPLICATION FILED JAN 15. 1907.

2SHEETSSHEET 2.

FlGI

MINVENTOR:

' with a rectangular opening 3,

.FltAN K B. SMIJII, Ol PI.lI LAl)ELPIIIA, PIQNNSYLVA NlA, ASSIGA'OR TO THE BARBER ASPHALT PAVING COMPANY, OF VIRGINIA.

A CORPORATION Ol AVES'l -1VIIXER-OPEN1NG DEVICE,

Application filed January 15, 1907.

Specification of Letters Patent.

Patented June so, 1908. Serial No, 852,896.

.10 all whom it may concern..-

Be it known that l, FRANK B. Sni'ru, of Philadelphia, in the State of Pennsylvania, have invented certain new and useful 1111- l provements in Alixe1=0pening Devices, whereof the following is a s pecilication, reference being had to the accompanying drawings.

My invention relates to devices for opening mixers such as are employed for mixing the ingredients used in the manufacture of asphalt paving.

The object of my device is to provide a l fluid actuated device for opening such al mixer; the iluidused bcing preferably coml pressed air or steam. l l

In the accompanving drawings, Figure I, is a plan view showing a mixer with my im proved opening device attached thereto. Fig. II, is a vertical section on the line II, II, in'Fig. l.

i In said drawings,

l, represents the recep tacle in which the material is placed and mixed by means ol the revolving blades 2.. The bottom 14 of the receptacle is provided I through which the contents of the mixer may be discharged said opening being closed by a sliding closure or slide bar -l, on the lower side of the reccp taclc. This closure comprises a plate 5, best shown in Fig. I, which may bcmade t0 register with the opening 3, of the mixer body when desired. This slide plate is shaped on its upper surface to conform to the outside of the bottom of the receptacle and is provided at each. end. with a projection or guide .lug 6, 7, which pass through openings 5%, and 9, respectively in the ends I0, 11, ot' the re ceptacle below the bottom thereof. These 0 )enings 8, and 9, serve to guide the slide plate and maintain it in proper relation to the opening 3, in the bottom of the rccep i tacle. l

Below the slide plate -:l-, are the rollers 12, 13, j ournaled in brackets 15, 16, respectively, 5 which are secured to the ends 10, ll, of the receptacle in any approved manner. The I rollers are so located as to be in line with the 5 projections 6, 7, on the slide plate, and therey form a support for said plate. Attached to the under side of the plate 5, by means of bolts 18, 19, is a shoulder block 17, to which i is secured one end of the piston rod 20, of the l mixer opening device. Toone end 10, of the receptacle below the line of travel of the slide bar, and its projection 6, is attached a cylinder 22, by means of casting 23, forming one head of the cylinder, said casting being provided with side flanges 24, through which the bolts 25, are passed, to securely fasten the cylinder to the end of the mixer. By thus locating the cylinder and connecting its piston 21, to the under side of the slide late 5, by means of the piston rod 20, an the shoulder block 17, a direct thrust. may be exerted [1.)011 the block to move the slide )latc. anu all the o )OIIIIW' mechanism is so ocatcd as not to interfere with the operation of the mixing mechanism, thus making a compact and eflicicnt device.

The mixer opcning device comprises the cylinder 22, provided with pipes for supplying compressed air or steam thereto, ant also provided with means for exhausting such air or steam therefrom. The compressed air may be obtained by means of piping from a compressor situated at some 0t ier portion of the plant and driven by an engine, or steam may be supplied from the boile1'.use l tor furnishing steam for running the plant. The supply pipe 30, is provided with a four way valve 31, which may be controlled by means oi a wrcnch or in any other suitable manner, and to this valve is also connected the exhaust pipe 32.

From opposite sides of the valve 31, and extending parallel with the cylinder, are pipes 34, and 35, each and 37. The lower end of the tee 36, is connected to the pipe 40, which connects with the forward end of the cylinder 22, and the lower end of the tee 2-37, is connected by means of a pipe 4.1, with thc rear end oi the cylinder 22. Extending from the forward end oi the tee 36, is a pipe 4-1, connectingwith the cylinder at a point between the forward end and the center thereof, and at the rear end of the tee 37, is similar pipe 45, connecting with the cylindcrat a point between the center and rear end.

In the position shown in the drawings the mixer is closed and the piston is at the extreme right hand of the cylinder. Ii. now the four-way valve be turned so as to admit air or steam, (depending upon which fluid is be ing utilized), the fluid passes-from the pipe 30, through the valve 31, through the pipe provided with tees 36,

35, tee 37, pipe 41, to the rear of the cylinder and back of the piston'Zl. The pipe 41, is provided with a plug cook 42, for regulating the amount of flow through said pipe. Usually the cock will be so adjusted that only a small amount of the fluid will enter the cylinder back of the piston when the deviceis started so that it will move slowly at first until the rear of the piston passes the opening e cylinder, whereupon-,-

of the pipe 45, in t the full force of the pressure is exerted upon the piston and it is moved quickly thereby moving the slide late 5, quickly and opening with a plug cook 43, similar to that in the pipe 41, and by adjusting the same a cushion may be formed at the left hand end of the piston when that end has passed the o ening of the pipe 44, thereby preventing the nocking out of the'cylinder head. To close the mixer, the four-way valve is turned to admit the fluid under ressure to the forward end of the cylinder and the opening in the lug cook 43, bein small, the piston trave s slowly toward t 1e right until it' passes the opening of the ipe 44, whereupon, the full pressure is exerte upon the piston and it moves uickly to close the mixer. It is understood t 1at the plug cock 42, restricts. the exhaust from the right hand end of the cylinder and thereby a cushion is formed as explained above with regard to the left hand end.

I claim v 1. A mixer having in combination a receptacle, the ends of which are rovided with openings; a slide plate provic ed with guide lugs to fit said openin s; a bottom for said receptacle provided wit a discharge 0 ening, said opening being normally closed y said slide late; a shoulder block on the under side of said slide plate; a piston rod connected to said shoulder block and extending in the direction in which said slide plate is moved to uncover said discharge opening; and a cylinder in line with said piston rod.

2. A mixer having in combination, a receptacle the ends of which are provided with openings; a slide plate provided with guide lugs to fit saido enings; rollers mounted to support said slire (plate; a bottom for said receptacle provide with a discharge 0 eniIlg, said opening being normally close by said slide plate; a shoulder block on the under side of said slide plate; a piston rod connected to said shoulder block; and a cylinder mounted to lie below the line of movement of the lugs on said slide plate and cooperating with said piston rod.

In testimony whereof, I have hereunto signed my name, at Philadelphia, Pennsylvania, this ninth day of January 1907.

FRANK B. SMITH.

l/Vitnesses JAMES H. BELL, WILLIAM J. SPERL. 

